Emily Boudreaux
ec13264050
A bug was discovered in glaze which prevented valid toml output. We have switched to toml++ and reflect-cpp. The interface has remained the same so this should not break any code
44 lines
1.1 KiB
C++
44 lines
1.1 KiB
C++
#ifndef RFL_INTERNAL_NTH_ELEMENT_HPP_
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#define RFL_INTERNAL_NTH_ELEMENT_HPP_
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#include <utility>
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namespace rfl::internal {
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template <class T, int N, int _i>
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struct ElementWrapper {
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T t_;
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};
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template <int N, class T1, int _i1, class T2, int _i2>
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constexpr auto operator|(const ElementWrapper<T1, N, _i1>& _e1,
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const ElementWrapper<T2, N, _i2>& _e2) {
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if constexpr (_i1 == N) {
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return _e1;
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} else {
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return _e2;
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}
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}
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template <class Head, class... Tail>
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constexpr auto find_matching_element(const Head& _head, const Tail&... _tail) {
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return (_head | ... | _tail);
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};
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template <int N, class... Ts, int... _is>
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constexpr auto wrap_elements(Ts... _ts, std::integer_sequence<int, _is...>) {
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return find_matching_element(ElementWrapper<Ts, N, _is>{_ts}...).t_;
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}
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template <int N, class... Ts>
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constexpr auto nth_element(Ts... _ts) {
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static_assert(N >= 0, "N out of bounds.");
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static_assert(N < sizeof...(Ts), "N out of bounds.");
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return wrap_elements<N, Ts...>(
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_ts..., std::make_integer_sequence<int, sizeof...(Ts)>());
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}
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} // namespace rfl::internal
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#endif
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